ONA Marine provide practical, safe, and engineered environmentally friendly mooring systems for installation to suit all kind of seabed conditions.
ONA Marine are committed to reducing the impacts to threatened seagrass and coral species and their critical habitats by the design and supply of environmentally friendly moorings. Moorings can negatively impact marine species but typically they are not detrimental to the survival of the species. We aim to make the convenience or inconvenience of the mooring more habitable.
Benthic impacts from moorings are caused by the concrete block anchor and the excesses length of chain (typically three times longer than the
depth of water where the floating vessel is moored) that lays on the seafloor. That excess chain
providessol catenary that dampens the dynamic forces on the vessel moored, which is critical for preventing the mooring from overloading and parting. However, environmental forcing of the buoy on
the water’s surface can drag the excess chain in a radius around the concrete block anchor. That scouring of the seafloor within the impact area radius damages or kills seagrasses and corals
living there.
The cost of an environmentally friendly mooring anchor is similar to the cost of a traditional concrete block anchor; but environmentally friendly mooring risers (rodes) can be more costly than the cost of traditional chain catenary moorings. Installation and maintenance costs may be greater for environmentally friendly moorings because their installation and maintenance are best performed by divers, which
represent an additional cost over typical vessel deployed concrete and railway wheel sinkers.
Environmentally friendly moorings are engineered and installed to suit specific locality requirements. Whether the anchor is a percussion driven earth anchor (PEDA) or screw anchor, the aim is to realise a mooring anchor solution that can take the induced vertical mooring loads and keep the mooring elements off the seafloor. ONA Marine are able to offer the necessary engineering considerations and geotechnical understanding in developing a an environmentally friendly solution, unique to your vessel and locality.